Cylinder door-lock



G. N. MASON.

CYLINDER DOOR LOCK.

APPLICATION FILED JAN. 11, 1912.

Patented July 16, 1912.

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G. N. MASON. CYLINDER noon LOOK.

APPLIOATION FILED JAN.11, 1912.

1 332,920. Patented July 16, 1912.

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CYLINDER DOOR-LOCK.

Application filed January 11, 1912.

To all whom it may concern:

Be it known that I, Gnonen N. MASON, a citizen of the United States, residing at Reading, in the county of Berks and State of Pennsylvania, have invented certain new and useful Improvements in Cylinder Door Locks, of which the following is a specification.

This lnventlon relates to lmprovements in door locks and the ob ect in the present 1nstance is to provide a lock for use on hotel inside as the only means for operating the bolts from that side.

With my lock, the upper cylinder is used for all ordinary purposes when the lock is operated from the outside, and the lower bolt is used only when operated from the inside by the thumb knob, or from the outside when the emergency key is to be used; in this construction the lower cylinder will not accommodate any of the keys except the emergency key and the upper cylinder will not accommodate the emergency key, but the lock construction is such that the operation of the lower bolt through the emergency key will retract the upper bolt while the lower boltis being projected, and a reverse movement of the emergency key will then retract the lower bolt. The parts are so arranged however, that after the door has been thus opened andagain locked by the emergency key, the other keys cannot open it as the lower bolt is projected and the upper bolt retracted and the keys, other than the emergency key, cannot enterthe lower cylinder through which alone the lower bolt may be retracted from the outside.

The invention is more fully described in the following specification and clearly illustrated in the accompanying drawing, in which Figure 1 is a plan view of my lock, with back plate removed, and both bolt-s retracted; Fig. 2 is an edge view of the complete lock; Fig. 3 is a sectional view through Specification of Letters Patent.

Patented July ltd, 1912.

Serial No. 670,556;

3-3 of Fig. 1; Fig. l is a partial view of the lock showing the upper bolt projected; and Fig. 5 is a like view showing the lower bolt projected and the upper bolt retracted.

The numeral 1 designates the casing; 2 the upper locking bolt; 3 the lower locking bolt; 4 the latch bolt; 5 the tumbleron the gplper bolt and 6, the tumbler on the lower 7 designates a yoke pivoted at its center to the casing and engaging the upper bolt in a relatively long opening 8 in the under side thereof while its lower end engages a relatively short opening 9 in the lower bolt.

10 designates a link, pivoted at its lower end to the lower tumbler 6 and formed at its upper end with an elongated slot- 11 which is engaged by a pin 12 on the upper tumbler 5.

13 designates a thumb knob located on the inside of the door and it carries a turn hub 14, backed by a spring 15, adapted to engage and depress the tumbler 6, thus permitting this lower bolt to be operated by the room occupant from the inside. It is clear that when this thumb knob is operated, with the parts as shown in Fig. 1, the lower bolt will be projected, assuming the position shown in Fig. 5, the upper end of the yoke moving in Eh? opening 8 without affecting the upper 16 and 17 designate respectively, the upper and lower key cylinders, having cams 18, through which the bolts are operated from the outside of the door.

Assuming the parts as shown in. Fig. 1, and the upper cylinder operated, projecting the upper bolt, it would assume the position shown in Fig. 4;; to retract this upper bolt from the inside, the thumb knob is turned, projecting the lower bolt, and through the medium of the yoke 7 the upper bolt will be retracted, inasmuch as the upper end of the yoke is then against the inner wall of the opening 8, this will leave the parts as shown in Fig. 5 and a reversal of the thumb knob will retract the lower bolt without affecting the upper bolt as the upper end of the yoke will travel forward in the opening 8 and assume the position as in Fig. 1. The upper bolt is free to be moved in either direction by any of the keys, except the emergency key, from the outside, and its movement will not aflectthe lower bolt, but, when the lower boltis projected, from either the inside by the thumb knob, or from the outside suring the full throw of the bolt 3.

by the emergency key, thus assuming the position shownin Fig. 5, it can not be re tracted by the operation of the upper cylinder, for this movement of the upper cam will depress the tumbler 5 but will not atfeet the link which connects it with the lower tumbler and will consequently not opcrate said lower tumbler to release the lower bolt. This is due to the slot 11 in the upper end of the link 10, allowing the pin 12 to move therein- With the parts as shown in Fig. 5, it will be noted that the link is not entirely at its lowermost position on the pin 12, so that when the lower tumbler is operated to retract the lower bolt, this space will permit the link to move downwardly while it is passing the Vertical center a sufficient distance, before it contacts with the pin .12, to permit the lower bolt to be retracted without affecting the upper tum bler.

The turn hub 14 is elongated in form and is backed with a spring 15 so that it will al ways assume a horizontal position, thus in- This lower bolt 3 is also provided with a depending projection which serves to dead lock the latch bolt when the lower bolt is projected, by engaging the inner surface of the latch bolt head. By means of this dead locking of the latch when the lower bolt is projected, the servant will know, when unsuccessfully attempting to turn the knob, that the occupant is inside the room, having turned the thumb knob, or that it has been locked by the emergency key and that an ,attempt to open with the master key would prove ineffectual.

Having thus fully described my invention, what I claim and desire to secure by Letters Patent is 1. The combination 6f the lock casing, the upper and lower locking bolts, the latch bolt, tumblers on the upper and lower bolts, the yoke pivoted to the casing and engaging both upper and lower locking bolts, the link pivoted to the lower tumbler and in sliding lower bolt for dead locking the latch bolt when the lower bolt is in projected position.

2. In a lock the combination of a casing, a latch bolt, an upper locking bolt, a lower locking bolt, a tumbler carried by each locking bolt, a link pivotally secured to the lower tumbler and having an elongated slot in its uppercend, a pin on the upper tum bler engaging the slot, a yoke pivoted in the casing engaging each of the locking bolts,

its engagement of the upper bolt being such 7 that the bolt may move in one direction without affecting the yoke and the yoke may move when the bolt is in either retracted or projected position without moving the bolt, a thumb knob on the inside of the door, a spring backed turn hub secured to said thumb knob located within the casing and adapted to operate the lower locking bolt, key cylinders for operating both bolts from the outside of the door, the upper bolt being operable from the outside by key direct or retractable through the operation of the lower bolt either by key from the outside or by the thumb knob from the inside, said upper bolt being operable directly by either a pass, a master or a grand master key and indirectly retractable through the lower bolt by the emergency key, while the lower bolt is operable from the outside only by said emer gency key.

In testimony whereof I atlix my signature in presence of two witnesses.

GEORGE N. MASON. Witnesses:

CLARA E. YOUNG, E1). A. KELLY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. 

